KRZYSZKOWSKI, Jerzy. Increasing importance of social services in the times of demographic challenge. Acta Universitatis Lodziensis. Folia Oeconomica, Poland, v. 2, n. 312, 2016. Disponível em: https://www.czasopisma.uni.lodz.pl/foe/article/view/397. Acesso em: 8 aug. 2026.